onsemi MC33269DTRK-0G 5V LDO Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide

The onsemi MC33269DTRK-0G is a robust, low-dropout (LDO) voltage regulator designed to deliver a fixed 5V output at currents up to 800mA. Housed in a space-saving DPAK surface-mount package, this IC is engineered for demanding applications requiring stable power with minimal noise. Its key advantage lies in its very low dropout voltage, typically 400mV at 800mA, allowing it to continue regulating effectively even when the input voltage dips close to the output level, which is crucial for battery-powered systems.

A critical feature of this regulator is its very low quiescent current and its own low power consumption, making it highly efficient. Furthermore, it incorporates essential internal protection mechanisms such as overcurrent protection and thermal shutdown, safeguarding both the regulator and the load from damage under fault conditions.

Pinout Configuration (DPAK-3)

The DPAK (TO-252) package has three connection points:

1. Input (VIN): This pin receives the unregulated input voltage, which must be higher than the dropout voltage (VOUT + VDO). A input capacitor is required near this pin for stability.

2. Ground (GND): The common ground reference for the regulator.

3. Output (VOUT): The regulated 5V output. An output capacitor is mandatory between this pin and ground to ensure stability and improve transient response.

Datasheet Highlights

The datasheet provides vital specifications for circuit design:

Output Voltage: Fixed at 5V (±2% accuracy)

Output Current: Up to 800 mA

Dropout Voltage (VDO): 400 mV (typ.) at 800mA

Line Regulation: 10 mV (typ.)

Load Regulation: 15 mV (typ.)

Operating Junction Temperature: -40°C to +125°C

Application Circuit Guide

A typical application circuit for the MC33269DTRK-0G is straightforward. The basic design requires only two external capacitors for proper operation, as shown in the schematic below.

```

+-------------+

VIN o---|VIN VOUT|----o VOUT (5V, 800mA max)

| | | |

C1 | | C2

| |_GND_| |

| |

GND o---------------------o GND

Where:

C1 = 10μF (Tantalum or Aluminum Electrolytic)

C2 = 10μF (Tantalum or Aluminum Electrolytic)

```

Circuit Design Notes:

1. Input Capacitor (C1): A 10μF tantalum or aluminum electrolytic capacitor should be placed as close as possible to the VIN pin. This capacitor is crucial for suppressing any incoming line transients and provides a local charge reservoir.

2. Output Capacitor (C2): A 10μF tantalum or aluminum electrolytic capacitor is required between the VOUT and GND pins. This component is essential for maintaining stability and determines the regulator's transient response. For best performance, place it close to the regulator.

This simple circuit can be integrated into a larger system to provide clean, regulated 5V power to microcontrollers, sensors, and other digital logic ICs from a higher unregulated input source (e.g., a 7V-12V wall adapter or battery).

ICGOODFIND Summary

The onsemi MC33269DTRK-0G is a highly reliable and efficient 5V LDO voltage regulator, prized for its low dropout voltage and robust 800mA output capability. Its simple two-capacitor design, combined with comprehensive internal protection features, makes it an excellent and fault-tolerant choice for a vast array of electronic devices, from consumer electronics to industrial systems.

Keywords: LDO Voltage Regulator, 5V Output, 800mA, Low Dropout Voltage, Thermal Protection